Ask the user to start Wi-Fi or 3G when launching the Android application if they are not connected to the Internet

Question

An Android app that accesses some online pages using WebView is what I work with. I want to enable the option when, if the user is not connected to the Internet, the application will offer to enable Wi-Fi or 3G.

What is the best way to achieve this user friendly point of view?

The code is below:

package com.url.appname; import android.net.Uri; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.Window; import android.webkit.ValueCallback; import android.webkit.WebView; import android.webkit.WebChromeClient; import android.webkit.WebViewClient; import android.widget.Toast; public class MainActivity extends Activity { private WebView wv; private ValueCallback<Uri> mUploadMessage; private final static int FILECHOOSER_RESULTCODE=1; @Override protected void onActivityResult(int requestCode, int resultCode, Intent intent) { if(requestCode==FILECHOOSER_RESULTCODE) { if (null == mUploadMessage) return; Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData(); mUploadMessage.onReceiveValue(result); mUploadMessage = null; } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); wv = new WebView(this); // wv = (WebView) findViewById(R.id.webview); wv.loadUrl("http://www.url.com"); // Let display the progress in the activity title bar, like the // browser app does. getWindow().requestFeature(Window.FEATURE_PROGRESS); wv.getSettings().setJavaScriptEnabled(true); final Activity activity = this; wv.setWebViewClient(new WebViewClient(){ public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show(); } }); wv.setWebChromeClient(new WebChromeClient() { public void onProgressChanged(WebView view, int progress) { // Activities and WebViews measure progress with different scales. // The progress meter will automatically disappear when we reach 100% activity.setProgress(progress * 100); } // For Android 3.0+ public void openFileChooser( ValueCallback<Uri> uploadMsg, String acceptType ) { mUploadMessage = uploadMsg; Intent i = new Intent(Intent.ACTION_GET_CONTENT); i.addCategory(Intent.CATEGORY_OPENABLE); i.setType("image/*"); MainActivity.this.startActivityForResult( Intent.createChooser( i, "File Chooser" ), MainActivity.FILECHOOSER_RESULTCODE ); } // For Android < 3.0 public void openFileChooser( ValueCallback<Uri> uploadMsg ) { openFileChooser( uploadMsg, "" ); } // For Android > 4.1 public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture){ openFileChooser( uploadMsg, "" ); } }); setContentView(wv); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }e 

Answer 1

Create an AlertDialog if there is no network connection to inform the user and request them.

Use this code as an example ...

 protected void createNetErrorDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage("You need a network connection to use this application. Please turn on mobile network or Wi-Fi in Settings.") .setTitle("Unable to connect") .setCancelable(false) .setPositiveButton("Settings", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { Intent i = new Intent(Settings.ACTION_WIRELESS_SETTINGS); startActivity(i); } } ) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { MyActivity.this.finish(); } } ); AlertDialog alert = builder.create(); alert.show(); } 

Creating an Intent using Settings.ACTION_WIRELESS_SETTINGS as an action will launch an inline action for network settings.